我試圖在C++中使用WinHTTP執行HTTP GET，但是在解析名稱後（在狀態回調函數中獲得WINHTTP_CALLBACK_STATUS_NAME_RESOLVED之後）它在某個時刻崩潰了。我在winhttp.dll中遇到訪問衝突。調用堆棧是：！！！winhttp.dll中的訪問衝突
winhttp.dll HTTP_USER_REQUEST :: _ IndicateSocketAddress（）+ 0x221ed字節
winhttp.dll HTTP_USER_REQUEST :: OnDnsNameResolved（）+ 0X24字節
winhttp.dll WEBIO_REQUEST :: _ OnInformation（） + 0x1c0c字節 [email protected]（）+ 0x15a字節 [email protected]（）+ 0x7a字節
[email protected]（）+值爲0x2F字節
webio.dll！_WapCallDnsQueryCompletion @ 12（）+ 0x6d bytes webio.dll！_WaDnsResolutio nWorker @ 8（）+ 0x157字節 [email protected]（）+ 0x7b字節
ntdll.dll中！ TppWorkerThread @ 4（）+ 0x5a4字節
KERNEL32.DLL！@ BaseThreadInitThunk @ 12（）+ 0×12字節
NTDLL.DLL！ ！ __RtlUserThreadStart @ 8（）+ 0×27字節
NTDLL.DLL __ RtlUserThreadStart @ 8（）+ 0x1b字節
相關的代碼是：
enum OnlineState
{
OnlineState_Idle,
OnlineState_Registering
};
static OnlineState g_OnlineState = OnlineState_Idle;
HINTERNET g_Request = 0;
HINTERNET g_Connection = 0;
unsigned char g_HTTPBuffer[1024];
void HTTPRequestComplete()
{
if(g_Request != 0)
{
WinHttpCloseHandle(g_Request);
g_Request = 0;
}
if(g_Connection != 0)
{
WinHttpCloseHandle(g_Connection);
g_Connection = 0;
}
g_OnlineState = OnlineState_Idle;
}
void HTTPAsyncCallback(HINTERNET hInternet, DWORD_PTR dwContext, DWORD dwInternetStatus, LPVOID lpvStatusInformation, DWORD dwStatusInformationLength)
{
switch(dwInternetStatus)
{
case WINHTTP_CALLBACK_STATUS_SENDREQUEST_COMPLETE:
{
// Get the response
if (!WinHttpReceiveResponse(g_Request, 0))
{
// Failed to get the response
HTTPRequestComplete();
return;
}
}
break;
case WINHTTP_CALLBACK_STATUS_HEADERS_AVAILABLE:
{
DWORD statusCode = 0;
DWORD statusCodeSize = sizeof(DWORD);
if (!WinHttpQueryHeaders(g_Request,
WINHTTP_QUERY_STATUS_CODE | WINHTTP_QUERY_FLAG_NUMBER,
WINHTTP_HEADER_NAME_BY_INDEX,
&statusCode,
&statusCodeSize,
WINHTTP_NO_HEADER_INDEX))
{
// Failed to query headers
HTTPRequestComplete();
return;
}
if (HTTP_STATUS_OK != statusCode)
{
// Error status
HTTPRequestComplete();
return;
}
if (!WinHttpReadData(g_Request,
g_HTTPBuffer,
sizeof(g_HTTPBuffer),
0))
{
// Error reading data
HTTPRequestComplete();
return;
}
}
break;
case WINHTTP_CALLBACK_STATUS_READ_COMPLETE:
{
if (dwStatusInformationLength > 0)
{
// Store the data
// Read the next data
if (!WinHttpReadData(g_Request,
g_HTTPBuffer,
sizeof(g_HTTPBuffer),
0))
{
// Error
HTTPRequestComplete();
return;
}
}
else
{
// Request completed OK
HTTPRequestComplete();
}
}
break;
default:
break;
}
}
// Online functionality
void Online_UpdateServer()
{
switch(g_OnlineState)
{
case OnlineState_Idle:
{
// Get our local ip address by connecting a local socket to a web address and reading the socket name
// Look up the address to connect to
addrinfo hints;
addrinfo* res = 0;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
getaddrinfo("www.google.com", "80", &hints, &res);
// Create the socket
int tempSocket = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
unsigned int localAddress = 0;
if (tempSocket >= 0)
{
// Connect the socket
connect(tempSocket, res->ai_addr, res->ai_addrlen);
// Get the socket name (our local ip address)
sockaddr_in localName;
memset(&localName, 0, sizeof(localName));
int bufferSize = sizeof(localName);
if(getsockname(tempSocket, (sockaddr*)&localName, &bufferSize) == 0)
{
// Get the IP address
localAddress = localName.sin_addr.S_un.S_addr;
}
closesocket(tempSocket);
}
// Connect
g_Connection = WinHttpConnect(g_Internet, L"www.google.com", INTERNET_DEFAULT_PORT, 0);
// Open the request
std::wstringstream urlString;
urlString << L"/";
std::wstring tempString = urlString.str();
const wchar_t* wurlString = tempString.c_str();
g_Request = WinHttpOpenRequest(g_Connection, 0, wurlString, 0, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, 0);
// Install the status callback function.
if(WINHTTP_INVALID_STATUS_CALLBACK == WinHttpSetStatusCallback(g_Request, (WINHTTP_STATUS_CALLBACK)HTTPAsyncCallback, WINHTTP_CALLBACK_FLAG_ALL_NOTIFICATIONS, NULL))
{
OutputDebugString(L"Error");
}
// Send the request
if(!WinHttpSendRequest(g_Request, WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0))
{
OutputDebugString(L"Error");
}
// Log that we're registering
g_OnlineState = OnlineState_Registering;
}
break;
case OnlineState_Registering:
{
// Don't do anything, as we're currently registering
}
break;
default:
break;
}
}
g_Internet被初始化這樣的：
// Initialise HTTP
g_Internet = WinHttpOpen(L"Boomba", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, WINHTTP_FLAG_ASYNC);
至於我可以告訴大家，我初始化並正確使用WinHTTP的，一切似乎又回來了確定沒有錯誤。回調被調用了兩次，第一次與WINHTTP_CALLBACK_STATUS_RESOLVING_NAME，然後用WINHTTP_CALLBACK_STATUS_NAME_RESOLVED，那之後我得到一個訪問衝突：
0000005：訪問衝突讀取位置0x00000014
的位置變化，各種各樣的東西，所以我我認爲它看起來可能是一個線程問題，但我不確定可能是什麼問題。有任何想法嗎？ （我在Windows 7 64位上運行）。
哪行代碼？也許有什麼東西在堆棧上被損壞？ – OldProgrammer